Abstract
We introduce a new quantum heat engine, in which the working medium undergoes quantum quasi-adiabatic and non-unitary processes to extract work in the cycle. Two kinds of working medium are considered. The first one consists of a three-level quantum system, whereas the second is a quantum system with a discrete level and a continuum. Net work done by this engine is calculated and discussed. The results show that this quantum heat engine behaves like the two-level quantum heat engine in both the high-temperature and low-temperature limits, but it operates differently at intermediate temperatures. The efficiency of this quantum heat engine is also presented and discussed.
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